Fix "pausing" the services section

[joewxboy]

In the following section: https://github.com/open-horizon/devops/blob/master/mgmt-hub/README.md#-pausing-the-services you show how to stop the services. The instructions assume that the person has a local copy of the script. However, the one-liner that we used to install and run the services did not save a local copy. You may fix that by adding the following to the instructions:

Save a local executable copy of the script by running:

curl -sSL https://raw.githubusercontent.com/open-horizon/devops/master/mgmt-hub/deploy-mgmt-hub.sh > deploy-mgmt-hub.sh
chmod a+x deploy-mgmt-hub.sh

[bmpotter]

#8 is ready for review

[joewxboy]

Fixed, closing